DK200190A - PROGRAMMABLE LOW VOLTAGE COMPRESSOR - Google Patents

PROGRAMMABLE LOW VOLTAGE COMPRESSOR Download PDF

Info

Publication number
DK200190A
DK200190A DK200190A DK200190A DK200190A DK 200190 A DK200190 A DK 200190A DK 200190 A DK200190 A DK 200190A DK 200190 A DK200190 A DK 200190A DK 200190 A DK200190 A DK 200190A
Authority
DK
Denmark
Prior art keywords
compressor
variolosser
gain
flowing out
peak detector
Prior art date
Application number
DK200190A
Other languages
Danish (da)
Other versions
DK200190D0 (en
Inventor
Fred Donald Waldhauer
Original Assignee
Resound Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Resound Corp filed Critical Resound Corp
Publication of DK200190D0 publication Critical patent/DK200190D0/en
Publication of DK200190A publication Critical patent/DK200190A/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/35—Electric hearing aids using translation techniques
    • H04R25/356—Amplitude, e.g. amplitude shift or compression
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Logic Circuits (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

A programmable low voltage compressor circuit suitable for use with hearing aids is described. The compressor has a continuously variable compression ratio wherein the gain of the compressor may be programmably controlled over a wide range and the compressor may be powered from a power source as low as 1.1 volt. The compressor employs a variolosser wherein the gain is controlled by the ratio of the currents flowing out of first and second control terminals. A control circuit coupled to the variolosser controls the magnitude of the currents flowing out of the two control terminals. The control circuit includes a peak detector which generates a signal related to the peak positive envelope of the signal input to the compressor. A voltage to current converter is coupled to the peak detector for increasing the magnitude of the current flowing out of one of the control terminals of the variolosser as the voltage output of the peak detector increases. Furthermore, the gain and compression ratio of the compressor over a wide range is programmably controllable.
DK200190A 1988-02-23 1990-08-21 PROGRAMMABLE LOW VOLTAGE COMPRESSOR DK200190A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/159,949 US4882761A (en) 1988-02-23 1988-02-23 Low voltage programmable compressor
PCT/US1989/000736 WO1989008371A1 (en) 1988-02-23 1989-02-23 Improved low voltage programmable compressor

Publications (2)

Publication Number Publication Date
DK200190D0 DK200190D0 (en) 1990-08-21
DK200190A true DK200190A (en) 1990-08-21

Family

ID=22574799

Family Applications (1)

Application Number Title Priority Date Filing Date
DK200190A DK200190A (en) 1988-02-23 1990-08-21 PROGRAMMABLE LOW VOLTAGE COMPRESSOR

Country Status (8)

Country Link
US (1) US4882761A (en)
EP (1) EP0401297B1 (en)
JP (1) JPH03503589A (en)
AT (1) ATE110220T1 (en)
AU (1) AU614597B2 (en)
DE (1) DE68917589T2 (en)
DK (1) DK200190A (en)
WO (1) WO1989008371A1 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144675A (en) * 1990-03-30 1992-09-01 Etymotic Research, Inc. Variable recovery time circuit for use with wide dynamic range automatic gain control for hearing aid
DE69233156T2 (en) * 1991-01-17 2004-07-08 Adelman, Roger A. IMPROVED HEARING AID
US5079517A (en) * 1991-02-04 1992-01-07 Motorola, Inc. Circuit for DC control of a compressor
US5278912A (en) * 1991-06-28 1994-01-11 Resound Corporation Multiband programmable compression system
US5196833A (en) * 1991-08-13 1993-03-23 Ford Motor Company Low voltage detector circuit
JP2890282B2 (en) * 1992-09-03 1999-05-10 ローム株式会社 Logarithmic conversion circuit
US5579404A (en) * 1993-02-16 1996-11-26 Dolby Laboratories Licensing Corporation Digital audio limiter
US5404115A (en) * 1993-09-01 1995-04-04 Threepenny Electronics Corporation Variable gain amplifier
US6072885A (en) * 1994-07-08 2000-06-06 Sonic Innovations, Inc. Hearing aid device incorporating signal processing techniques
US8085959B2 (en) 1994-07-08 2011-12-27 Brigham Young University Hearing compensation system incorporating signal processing techniques
DE4427974C1 (en) * 1994-08-08 1996-01-18 Siemens Ag Bipolar cascadable circuit arrangement for signal limitation and field strength detection
US5600728A (en) * 1994-12-12 1997-02-04 Satre; Scot R. Miniaturized hearing aid circuit
US6112103A (en) * 1996-12-03 2000-08-29 Puthuff; Steven H. Personal communication device
US6084471A (en) * 1997-12-19 2000-07-04 Nokia Mobile Phones Soft-limiting control circuit for variable gain amplifiers
EP1051879B1 (en) * 1998-01-12 2005-09-21 IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY & MEDICINE Audio signal processors
US6405164B1 (en) 1999-12-30 2002-06-11 Engineering Consortium, Inc. Audio compression circuit and method
US6445233B1 (en) 1999-12-30 2002-09-03 The Engineering Consortium, Inc. Multiple time constant rectifier apparatus and method
US6362688B1 (en) * 2000-04-26 2002-03-26 Maxim Integrated Products, Inc. System and method for optimal biasing of a telescopic cascode operational transconductance amplifier (OTA)
KR100403637B1 (en) * 2002-01-26 2003-10-30 삼성전자주식회사 Power amplifier clipping circuit for minimizing output distortion
KR100968401B1 (en) * 2008-10-16 2010-07-07 한국과학기술원 Display drive
US8902002B2 (en) * 2012-05-30 2014-12-02 Nujira Limited Adaptive biasing scheme for an amplifier
EP2898705B1 (en) 2012-09-18 2017-08-23 Sonova AG Cic hearing device
US10291207B2 (en) 2016-07-07 2019-05-14 Analog Devices, Inc. Wide range programmable resistor for discrete logarithmic control, and tuning circuit for variable gain active filter using same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784750A (en) * 1972-02-25 1974-01-08 Shalako Resource Systems Apparatus and prosthetic device for providing electronic correction of auditory deficiencies for aurally handicapped persons
JPS5154703A (en) * 1974-11-08 1976-05-14 Oki Electric Ind Co Ltd
US4253072A (en) * 1979-07-09 1981-02-24 Fisher Charles B Compandor with sampling and equalization
GB2111356B (en) * 1981-12-01 1985-03-20 Ray Milton Dolby Improvements in circuit arrangements for modifying dynamic range
US4696044A (en) * 1986-09-29 1987-09-22 Waller Jr James K Dynamic noise reduction with logarithmic control

Also Published As

Publication number Publication date
DE68917589D1 (en) 1994-09-22
US4882761A (en) 1989-11-21
JPH03503589A (en) 1991-08-08
EP0401297B1 (en) 1994-08-17
AU3285589A (en) 1989-09-22
ATE110220T1 (en) 1994-09-15
AU614597B2 (en) 1991-09-05
DK200190D0 (en) 1990-08-21
EP0401297A4 (en) 1991-06-05
DE68917589T2 (en) 1994-12-22
EP0401297A1 (en) 1990-12-12
WO1989008371A1 (en) 1989-09-08

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Legal Events

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ATS Application withdrawn